Diesel is injected into the cylinder under high pressure and the piston is at TDC only for a very short time. There is no time to make the diesel condensate.
Also, when the piston is at TDC most of the diesel will already have been burned.
The combustion reaction starts well before TDC, raising the temperature and rapidly lowering the remaining fuel content.
So I don't think condensation in the cylinder head is much of a problem.
Your block of text was nicely condensed though
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.2 Gigameter or 0.13 Megamile.
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